- #1

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{-b ± SQRT(b^2 - 4ac)}/2a

and

{-b ± SQRT(b^2 -ac)}/2a

I don't know when to use either equation, always having used the first, and for someone at my level to have just encountered this is fairly embarressing (undergraduate on Physics)!

Any quick answers is REALLY appreciated, or an explanation of why etc, or even a website describing this would be very helpful!